Is there a the safe and effective non-flaming heater that I can use to warm the cabin of my boat while I'm trolling during the winter with my kicker motor (15hp 2 stroke)? The heat from the main engine (chev 350 with fresh water cooling) lasts only for a little while after it is shut off and some trolling routes take quite a while. Even with the cabin door closed it can get quite cold as I still like to keep a window or two ajar for a little fresh air. I prefer not to troll with the main engine as subsequent performance suffers from running too long at a low rpm. The cabin has a two-burner alcohol stove that I don't like to use unless I'm at the dock. Thanks for your ideas and comments.